Borge, I wonder if you have tried to cooperate two different types of autoregulation methods in one workout.
first exercise - heavy compound up to top set in range 5-8 reps
second - isolation movement myo-reps set 12-15+3x

In terms of training frequency what would you recommend for the average intermediate trainee every 5th day or twice/week using these methods?

I was kinda off-handedly wondering about Myo-Reps being used instead of the DC rest-pause, with a DC-style bodypart split on a M/W/F with ABA BAB scheduling.

Not for me, personally, I like what I have been doing, but it seems like a workable plan for someone that liked the DC-style BB workouts but didn't cope well with actually hitting failure on a daily basis. With M-R there's better autoregulation IMO because of the RPE 9 "coming close to failure" method.